body {
    height: 100%;
    background-image: url(../image/qaq.jpg);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-color: lightyellow;
    background-position: right top;
    margin-right: 240px;
}

/* id 选择器 */
#para1 {
    text-align: center;
    color: red;
}

/* class 选择器 */
.form-login {
    width: 100%;
    max-width: 400px;
    padding: 15px;
    margin: 0 auto;
}

.form-login {
    margin-top: 80px;
    font-weight: 400;
}

.form-login .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
}

.form-login .form-control:focus {
    z-index: 2;
}

.form-login input[type="text"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.form-login input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

form a {
    display: inline-block;
    margin-top: 25px;
    font-size: 20px;
    line-height: 10px;
}

/* 也可以指定特定的HTML元素使用class */
p.center {
    text-align: center;
    vertical-align: top;
}

a:link {
    color: #000000;
}

/* 未访问链接*/
a:visited {
    color: #00FF00;
}

/* 已访问链接 */
a:hover {
    color: #FF00FF;
}

/* 鼠标移动到链接上 */
a:active {
    color: #0000FF;
}

/* 鼠标点击时 */

a:link,
a:visited {
    display: block;
    font-weight: bold;
    color: #FFFFFF;
    background-color: #98bf21;
    width: 120px;
    text-align: center;
    padding: 4px;
    text-decoration: none;
}

a:hover,
a:active {
    background-color: #7A991A;
}


ul
{
    list-style-type: none;
    padding: 0px;
    margin: 0px;
}
ul li
{
    background-image: url(sqpurple.gif);
    background-repeat: no-repeat;
    background-position: 0px 5px; 
    padding-left: 14px; 
}